中国神经再生研究(英文版) ›› 2017, Vol. 12 ›› Issue (12): 2092-2099.doi: 10.4103/1673-5374.221169

• 原著:神经损伤修复保护与再生 • 上一篇    下一篇

Notch通路抑制剂DAPT提高Atoh1活性促进耳蜗感觉上皮原位毛细胞再生

  

  • 收稿日期:2017-10-25 出版日期:2017-12-15 发布日期:2017-12-15
  • 基金资助:

    国家自然科学基金(81420108010, 81271084, 81200740, 81371093)

Notch pathway inhibitor DAPT enhances Atoh1 activity to generate new hair cells in situ in rat cochleae

Wen-wei Luo1, 2, Zhao Han1, 2, Dong-dong Ren1, 2, Xin-wei Wang1, 2, Fang-lu Chi1, 2, Juan-mei Yang1, 2   

  1. 1 Department of Otolaryngology, Eye & ENT Hospital of Fudan University, Shanghai, China
    2 Research Institute of Otolaryngology, Fudan University, Shanghai, China
  • Received:2017-10-25 Online:2017-12-15 Published:2017-12-15
  • Contact: Fang-lu Chi or Juan-mei Yang,Ph.D., chifanglu@126.com or yangjuanmei1982@126.com.
  • Supported by:

    This study was supported by the National Natural Science Foundation of China, No. 81420108010, 81271084, 81200740, 81371093.

摘要:

研究证实,Atoh1基因过表达于耳蜗上皮可诱导毛细胞再生。携带Atoh1的病毒转染于大鼠耳蜗上皮时,主要转染异位区域的小上皮脊区域,从而诱导小上皮脊异位毛细胞再生,而大鼠耳蜗感觉上皮的原位区域难以被转染,故原位毛细胞再生较为困难。实验使用10%的胎牛血清作用于大鼠耳蜗感觉上皮,使大鼠耳蜗感觉上皮区域支持细胞间距增加,延伸感觉上皮,并用携带Atoh1基因的腺病毒联合转染大鼠耳蜗感觉上皮区域,从可诱导耳蜗感觉上皮毛细胞再生。再通过Notch通路抑制剂DAPT与Atoh1基因同时转染大鼠耳蜗感觉上皮区域后发现,Notch通路抑制剂DAPT可上调Atoh1基因表达,并下调hes1及hes5基因表达,更为显著的促进了Atoh1基因诱导的耳蜗原位区域毛细胞再生。结果数据显示,Notch通路抑制剂DAPT通过提高Atoh1活性,促进了体外培养的大鼠耳蜗感觉上皮原位区域毛细胞的再生。

orcid:0000-0002-3243-0393(Fang-lu Chi)
0000-0001-5125-3532(Juan-mei Yang)

 

关键词: 神经再生, Atoh1, DAPT, 转分化, r-分泌酶抑制剂, 耳蜗, 感觉上皮, 胎牛血清, 毛细胞, 支持细胞, 毛细胞再生

Abstract:

Atoh1 overexpression in cochlear epithelium induces new hair cell formation. Use of adenovirus-mediated Atoh1 overexpression has mainly focused on the rat lesser epithelial ridge and induces ectopic hair cell regeneration. The sensory region of rat cochlea is difficult to transfect, thus new hair cells are rarely produced in situ in rat cochlear explants. After culturing rat cochleae in medium containing 10% fetal bovine serum, adenovirus successfully infected the sensory region as the width of the supporting cell area was significantly increased.Adenovirus encoding Atoh1 infected the sensory region and induced hair cell formation in situ. Combined application of the Notch inhibitor DAPT and Atoh1 increased the Atoh1 expression level and decreased hes1 and hes5 levels, further promoting hair cell generation. Our results demonstrate that DAPT enhances Atoh1 activity to promote hair cell regeneration in rat cochlear sensory epithelium in vitro.

Key words: nerve regeneration, Atoh1, DAPT, transdifferentiation, gamma secretase inhibitor, cochlea, sensory epithelium, fetal bovine serum, hair cell, supporting cell, hair cell regeneration, neural regeneration